Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/mbed_overrides.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 2 * @file mbed_overrides.c
<> 144:ef7eb2e8f9f7 3 *******************************************************************************
<> 144:ef7eb2e8f9f7 4 * @section License
<> 144:ef7eb2e8f9f7 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
<> 144:ef7eb2e8f9f7 6 *******************************************************************************
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * SPDX-License-Identifier: Apache-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 144:ef7eb2e8f9f7 11 * not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 12 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 13 *
<> 144:ef7eb2e8f9f7 14 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 144:ef7eb2e8f9f7 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 19 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 20 * limitations under the License.
<> 144:ef7eb2e8f9f7 21 *
<> 144:ef7eb2e8f9f7 22 ******************************************************************************/
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 #include "em_chip.h"
<> 144:ef7eb2e8f9f7 25 #include "em_device.h"
<> 144:ef7eb2e8f9f7 26 #include "em_cmu.h"
<> 144:ef7eb2e8f9f7 27 #include "em_emu.h"
<> 144:ef7eb2e8f9f7 28 #include "device_peripherals.h"
<> 144:ef7eb2e8f9f7 29 #include "device.h"
<> 144:ef7eb2e8f9f7 30 #include "em_usart.h"
<> 144:ef7eb2e8f9f7 31 #include "gpio_api.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 gpio_t bc_enable;
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 /* Called before main - implement here if board needs it.
<> 144:ef7eb2e8f9f7 36 * Otherwise, let the application override this if necessary */
<> 144:ef7eb2e8f9f7 37 void mbed_sdk_init()
<> 144:ef7eb2e8f9f7 38 {
<> 144:ef7eb2e8f9f7 39 CHIP_Init();
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 #if defined(_SILICON_LABS_32B_PLATFORM_2)
<> 144:ef7eb2e8f9f7 42 EMU_DCDCInit_TypeDef dcdcInit = EMU_DCDCINIT_DEFAULT;
<> 144:ef7eb2e8f9f7 43 EMU_DCDCInit(&dcdcInit);
<> 144:ef7eb2e8f9f7 44 #endif
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 /* Set up the clock sources for this chip */
<> 144:ef7eb2e8f9f7 47 #if( CORE_CLOCK_SOURCE == HFXO)
<> 144:ef7eb2e8f9f7 48 CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFXO);
<> 144:ef7eb2e8f9f7 49 SystemHFXOClockSet(HFXO_FREQUENCY);
<> 144:ef7eb2e8f9f7 50 #elif( CORE_CLOCK_SOURCE == HFRCO)
<> 144:ef7eb2e8f9f7 51 CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFRCO);
<> 144:ef7eb2e8f9f7 52 # if defined _CMU_HFRCOCTRL_BAND_MASK
<> 144:ef7eb2e8f9f7 53 CMU_HFRCOBandSet(HFRCO_FREQUENCY);
<> 144:ef7eb2e8f9f7 54 # elif defined _CMU_HFRCOCTRL_FREQRANGE_MASK
<> 144:ef7eb2e8f9f7 55 CMU_HFRCOFreqSet(HFRCO_FREQUENCY_ENUM);
<> 144:ef7eb2e8f9f7 56 # else
<> 144:ef7eb2e8f9f7 57 # error "Can't set HFRCO frequency"
<> 144:ef7eb2e8f9f7 58 # endif
<> 144:ef7eb2e8f9f7 59 #else
<> 144:ef7eb2e8f9f7 60 # error "Core clock selection not valid (mbed_overrides.c)"
<> 144:ef7eb2e8f9f7 61 #endif
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 CMU_ClockEnable(cmuClock_CORELE, true);
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 #if( LOW_ENERGY_CLOCK_SOURCE == LFXO )
<> 144:ef7eb2e8f9f7 66 # ifdef _CMU_LFACLKEN0_MASK
<> 144:ef7eb2e8f9f7 67 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFXO);
<> 144:ef7eb2e8f9f7 68 # endif
<> 144:ef7eb2e8f9f7 69 # ifdef _CMU_LFBCLKEN0_MASK
<> 144:ef7eb2e8f9f7 70 /* cmuClock_LFB (to date) only has LEUART peripherals.
<> 144:ef7eb2e8f9f7 71 * This gets set automatically whenever you create serial objects using LEUART
<> 144:ef7eb2e8f9f7 72 */
<> 144:ef7eb2e8f9f7 73 # endif
<> 144:ef7eb2e8f9f7 74 # ifdef _CMU_LFECLKEN0_MASK
<> 144:ef7eb2e8f9f7 75 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFXO);
<> 144:ef7eb2e8f9f7 76 # endif
<> 144:ef7eb2e8f9f7 77 SystemLFXOClockSet(LFXO_FREQUENCY);
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 #elif( LOW_ENERGY_CLOCK_SOURCE == LFRCO )
<> 144:ef7eb2e8f9f7 80 # ifdef _CMU_LFACLKEN0_MASK
<> 144:ef7eb2e8f9f7 81 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFRCO);
<> 144:ef7eb2e8f9f7 82 # endif
<> 144:ef7eb2e8f9f7 83 # ifdef _CMU_LFBCLKEN0_MASK
<> 144:ef7eb2e8f9f7 84 //CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFRCO);
<> 144:ef7eb2e8f9f7 85 # endif
<> 144:ef7eb2e8f9f7 86 # ifdef _CMU_LFECLKEN0_MASK
<> 144:ef7eb2e8f9f7 87 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFRCO);
<> 144:ef7eb2e8f9f7 88 # endif
<> 144:ef7eb2e8f9f7 89
<> 144:ef7eb2e8f9f7 90 #elif( LOW_ENERGY_CLOCK_SOURCE == ULFRCO)
<> 144:ef7eb2e8f9f7 91 # ifdef _CMU_LFACLKEN0_MASK
<> 144:ef7eb2e8f9f7 92 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_ULFRCO);
<> 144:ef7eb2e8f9f7 93 # endif
<> 144:ef7eb2e8f9f7 94 # ifdef _CMU_LFBCLKEN0_MASK
<> 144:ef7eb2e8f9f7 95 CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_ULFRCO);
<> 144:ef7eb2e8f9f7 96 # endif
<> 144:ef7eb2e8f9f7 97 # ifdef _CMU_LFECLKEN0_MASK
<> 144:ef7eb2e8f9f7 98 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_ULFRCO);
<> 144:ef7eb2e8f9f7 99 # endif
<> 144:ef7eb2e8f9f7 100 #else
<> 144:ef7eb2e8f9f7 101 # error "Low energy clock selection not valid"
<> 144:ef7eb2e8f9f7 102 #endif
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 /* Enable BC line driver to avoid garbage on CDC port */
<> 144:ef7eb2e8f9f7 105 gpio_init_out_ex(&bc_enable, EFM_BC_EN, 1);
<> 144:ef7eb2e8f9f7 106 }